title: 530 W, 1.3 mJ, four-channel coherently combined femtosecond fiber chirped-pulse amplification system.
abstract: We report on a femtosecond fiber laser system comprising four coherently combined large-pitch fibers as the main amplifier. With this system, a pulse energy of 1.3 mJ and a peak power of 1.8 GW are achieved at 400 kHz repetition rate. The corresponding average output power is as high as 530 W. Additionally, an excellent beam quality and efficiency of the combination have been obtained. To the best of our knowledge, such a parameter combination, i.e., gigawatt pulses with half a kilowatt average power, has not been demonstrated so far with any other laser architecture.
authors.affiliation: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Str. 15, Jena 07745, Germany. arno.klenke@uni‑jena.de
authors.forename: Arno
authors.initials: A
authors.lastname: Klenke
authors.forename: Sven
authors.initials: S
authors.lastname: Breitkopf
authors.forename: Marco
authors.initials: M
authors.lastname: Kienel
authors.forename: Thomas
authors.initials: T
authors.lastname: Gottschall
authors.forename: Tino
authors.initials: T
authors.lastname: Eidam
authors.forename: Steffen
authors.initials: S
authors.lastname: Hädrich
authors.forename: Jan
authors.initials: J
authors.lastname: Rothhardt
authors.forename: Jens
authors.initials: J
authors.lastname: Limpert
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann